JPH0325957B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a case where the wall portions of the case are connected to each other in the form of a flange or a lid, as is known, for example, in screwless multiple socket outlets in household extension cables. and is tacked by at least one safety rivet which is constructed harder than the material of at least one of the wall parts to be joined and is removable only by breaking, the tack end of this safety rivet being retractable. This relates to a safety device installed to prevent illegal opening of the case.

[Conventional technology]

Other technically demanding industrial products can also be protected from unauthorized opening by such safety devices.
The additional purpose is to prove any unlawful interference that may still take place. In the event of such an unlawful intervention, any warranty claim against the manufacturer is nullified by regulation, since the manufacturer cannot be held responsible for operations carried out after the equipment has been unlawfully opened. In certain cases, the satisfactory operation of the equipment enclosed by the housing part makes it possible to avoid major subsequent damage that could occur under certain circumstances due to illegal manipulation. at that time,
Manufacturer liability gives the manufacturer an unassessable recourse that can only be avoided if the operation is fully proven. The basis for such manipulation is unknown, and it is true that it occurs.

In conventional rivet tightening of case parts, the rivets were drilled to open the case, and proof of operation was not possible since the case part was closed in an orderly manner by the rivets purchased after the device was closed. Such case parts are sometimes screwed together, and the screws are made secure with a sealant. In this case it is impossible in any case to prove the illegal opening of the case. This is because, after carefully removing the old sealing paint and applying a new sealing paint of the same properties, the equipment can be sealed again in an orderly manner. Lead seals also do not provide reliable proof of accidental release. This is because lead can be inadvertently stripped when working near such equipment.

It is also conceivable to glue the housing parts together in such a way that they can only be opened by destruction in any case, but authorized maintenance of the parts enclosed by the housing is not possible. The same applies to the possible welding of both housing parts if they are made of thermoplastic.

[Problem that the invention seeks to solve]

The object of the invention is to design a safety device of the first type in such a way that such an intervention can always be reliably proven in the event of an illegal opening of a housing part.

[Means for solving problems]

In order to solve this problem, according to the present invention, when the case part is made of aluminum or plastic, the safety stud is made of steel, preferably gold steel, and the end of the stud is caulked loosely but without any play, so that this caulking is prevented. The safety stud is easily rotatable, or the safety stud is integrated with the harder of the case parts and made of the same material.

Further suitable developments of the invention can be seen from the dependent claims.

〔Effect of the invention〕

Since the hardness of the safety stud material is greater than the hardness of the case material, the case cannot be opened without leaving a mark and can be replaced by a similar safety stud when closing the case. Due to the great hardness of the safety studs, corrosion or crushing marks are visible on the case wall as long as the safety studs are removed. Thus, in a suitable configuration, the safety stud made of alloy steel is so loosely tacked that when an attempt is made to drill it, this safety stud rotates in the stud hole and is therefore not drilled. Since the rivet end is retracted, it is impossible to hold the rivet with pliers.

〔Example〕

The invention will be explained below on the basis of the embodiments shown in the drawings.

The case shown in Figure 1 has a plate-like lower case part 2.
and a cap-shaped upper case part 1. In the edge area, the flanged-shaped wall parts 3 and 4 are connected to each other, and in this flange area the mounting screws 6 are inserted.
It is also screwed to the retaining wall 5. In the flange area, in the illustrated embodiment, safety studs 7, which will be described below, are fitted at two opposite locations. It is only mentioned here that although the safety stud also assumes the function of connecting the two housing parts 1, 2, its main purpose is to prove illegal opening. The two housing parts 1, 2 are held together by screws 6, by means of which the housing parts are also screwed to the retaining wall 5.

to the separation seam 12 between the two wall parts 3 and 4;
In order to prevent the application of sharp tools such as blades or pointed screwdrivers from the outside in order to spread the wall sections apart, the separation seam between the wall sections is provided recessed at the outer edge and covered with an apron 13. It is being said. This apron 13 attached to the upper case part 1 surrounds the outer edge of the lower case part 2 without any play, so that the separation seam 12 cannot be accessed from the outside. The separation seam is thereby also protected against the ingress of moisture and the like.

In the embodiment of FIG. 2, which shows an enlarged view of the flange-shaped area of the case indicated by a circle in FIG. have. The wall part 3 belonging to the upper case part 1 has a flat cylindrical countersink 10 into which the flat head-shaped rivet end 8 is inserted, into which the rivet end can be completely immersed. The hollow safety stud 7 has an inner diameter that is large enough to allow the mounting screw 6 to pass therethrough. With such a configuration, additional holes for safety studs are not required. Furthermore, the larger the diameter of the safety stud, the more difficult it becomes to drill the hole.
More secure against drilling. Although the torque for drilling increases as the size of the hole increases, the force holding the loosely caulked safety stud in the flange-like wall portions 3, 4 is relatively small and is almost independent of the stud diameter. Note that hollow studs are easier to caulk than solid studs.

The lower wall part 4 has a conical countersink 11 for the insertion of the stud end 9 to be caulked, into which the initially still hollow cylindrical shank of the safety stud 7 is pressed with a corresponding conical angle. , thus the safety stud is crimped. Care must be taken in this case so that the stud end 9 is free of play but not too tightly crimped and may still be rotated if necessary. This ensures that the safety stud is not punctured. In principle, it would also be possible to caulk the lower rivet end until it forms a flat head, but with highly hard materials this is unnecessary and not immediately possible. Apart from this, due to the high material hardness of the safety studs, the wall parts 3, 4 also deform uncontrollably in the area of the countersinks.

Another puncture prevention measure for the safety stud is to use high-strength steel material for the safety stud, as suggested in FIGS. It is assumed that the material is made of plastic or aluminum with a high temperature. Due to the hardness of the safety stud, which is large compared to the material of the wall part, and due to the loose staking of the safety stud, when attempting to drill, the safety stud will definitely leave a friction mark on the wall part, following a futile drilling attempt. Even if an attempt is made to disconnect the safety stud through the use of microdissection discs, these marks are still visible and indicate illegal intervention.

Another important feature regarding puncture prevention is that, besides the high hardness and loose staking of the safety stud, both stud ends are completely accommodated in the countersinks 10 and 11, so that the pliers do not have to be used during a drilling attempt. This makes it impossible to hold the safety stud from rotating. The upper stud end 8 is thus forced into the corresponding flat cylindrical countersink 10 with as precise a fit as possible. Similarly, the lower rivet end 9
It is also important that the conical countersink 11 does not protrude. The safety studs must therefore be carefully matched to the thickness of both wall sections 3 and 4.

In the embodiment shown in FIG. 3, the safety stud 7' is integrated with the upper wall part 3', made of aluminum, for example, and forms therewith a continuous workpiece. The above-mentioned high material hardness of the safety stud is not taken into account here, and the safety stud is also not freely rotatable. However, an illegal opening of the housing can be immediately proven, since the safety stud 7' integrated into the workpiece disappears during drilling and can only be replaced with another stud when the housing is reclosed.

In the embodiment shown in FIG. 4, the countersink 11' in the lower wall part 4' is of double-conical design, and the safety stud 7'' is chosen to be slightly shorter than in FIG. 2. Due to the double conical configuration of 11', the outer edge of the rivet end 9' to be crimped is better protected against intervention by a tool which bends the crimped rivet end back into the cylindrical shape shown in dashed lines. That is, if the crimped rivet end can be bent back into a cylindrical shape, pliers capable of holding the safety rivet can be conveniently applied so that the rivet end can be safely bent back into a cylindrical shape without leaving any visible consequences on the wall section. This means that the stud can be drilled.The caulked stud end 9'
It is also conceivable to bend other circumferential parts of the safety stud into a cylindrical shape, eventually forcing the stud out of the stud hole, thereby also removing the safety stud without leaving any visible traces on the workpiece.

The greatest protection against such operations is
The embodiment according to FIG. 5 is given. Here, the safety stud 7 is cast with a flat stud end 8' with a knurled edge into the upper wall part 3' and is thus integrated therewith. Again, some degree of rotation prevention is provided, but because the safety stud is integrally provided, removal of the safety stud without leaving visible consequences is not possible. The countersink 11'' in the lower wall section 4'' is initially cylindrical-conical. In this embodiment also short safety rivets have to be used, but after crimping the lower rivet end 9', an annular groove 15 is formed around the first countersink 11' by means of a staggered rivet driving method with an annular toothed tool. The edge of this groove is pushed out over the edge of the caulked rivet end 9', so that this rivet end is completely covered. By means of an additional blow with the conical tool, the bulged edge material can be forced into the conically swaged lower rivet end, as shown in FIG. The safety stud is then completely covered and no longer accessible to tools.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of the case parts connected to each other by a safety stud, and FIGS. 2 to 5 are cross-sectional views of different embodiments of the safety stud. 1, 2...Case part, 3, 4...Flanged wall part, 7, 7', 7'', 7...Safety stud, 9,
9'...Tack end.

Claims (1)

[Claims] 1. The wall parts of the case are connected to each other in a flange-like or lid-like manner, and the wall parts of the case are made of a harder material than the material of at least one of the joined wall parts and can be removed only by destruction. Case parts 1 and 2 are fastened with at least one safety rivet, and the rivet ends of the safety rivets are retractable.
is made of aluminum or plastic, the safety rivets 7, 7' are made of steel, and the rivet ends 9,
A safety device for preventing illegal opening of a case, characterized in that 9' is caulked loosely but without any play, so that the caulked safety studs 7, 7' can be easily rotated. 2. Claim 1, characterized in that the retractable rivet end 9' of the safety rivet 7 to be crimped is covered in an interlocking manner by a crimping edge material 14 of the countersink 11'. The device according to item 1. 3. The rivet ends 9, 9' to be caulked and the wall portion 4,
The device according to claim 1 or 2, characterized in that the corresponding countersinks 11, 11', 11'' in 4' are of conical construction.4. Device according to claim 1 or 2 or 3, characterized in that a preformed head is cast into the material of one case part 3''. 5. Claim 1, characterized in that the separation seam 12 between the case parts 1, 2 to be joined is recessed or covered at the outer edge.
The equipment described in section. 6 The wall parts of the case are connected to each other in a flange-like or lid-like manner by at least one safety stud which is made harder than the material of at least one of the wall parts to be connected and is removable only by breaking. In the case where the rivet is tightened and the rivet end of the safety rivet is retracted, the safety rivet 7' is integrated with the harder case part 3' and made of the same material. Features a safety device that prevents the case from being opened illegally. 7. Device according to claim 6, characterized in that the retractable rivet end of the safety rivet to be crimped is covered in an interlocking manner by the edge material of the countersink to be crimped. . 8. The rivet end portion to be crimped and the corresponding countersink hole in the wall portion are configured in a conical shape,
An apparatus according to claim 6 or 7. 9. Device according to claim 6, characterized in that the separation seam between the case parts to be joined is recessed or covered at the outer edge.